Shadow Ball: Good power, high accuracy, STAB, used to deal with Ghost types, decent chance to lower Sp. Def.

Spite: Lowers the foes PP.

Psychic: Good power, high accuracy, chance to lower Sp. Def.

Energy Ball: Good power, high accuracy, chance to lower Sp. Def like almost every move with a power range of 80-90 nowadays. Remember when almost every move was unique in it's ability, power, PP, and accuracy. Almost no move was the same in at least three ways. Now look at my moveset.

- Substitute-Perfect for coming in on something like a Scarfed staraptor or almost any supportive normal type. Allows it to set up as they switch. - Shadow Ball-STAB.- Hidden Power [fighting]-Covers dark weakness as well as normal types that try to come in on shadow ball immunity. - Nasty Plot-Boosts up special attack.

Shadowball: STAB, deals with Ghost weakness. Dazzling Gleam: Deals with Dark weakness.Calm Mind: Boosts her already good Special Attack for more damage and boosts her good Special Defense.Pain Split: My favorite move in Pokemon. When your low on HP use this on a higher HP Pokemon to really mess with them, a great move for healing and dealing damage.

Shadow ball is strong stab move, energy ball is nice coverage, and psychic is also nice coverage
Now, here it really depends on you:
if you want to annoy physical attackers with confuse ray,
take out a Pokemon when at low hp with destiny bond,
cover dark weakness with dazzling gleam,
or take out those pesky normal types with Hp (fighting)

Nasty Plot is for boosting her Special Attack by two stages, making her a powerful sweeper.
Shadow Ball is STAB and has good neutral coverage on almost all types.
Dazzling Gleam is to hit Dark types that threaten her. Also used to hit Fighting and Dragon types. Hidden Power Fighting can also be used to hit Dark types as well as Steel, Rock, Normal and Ice types.
Thunderbolt or Energy Ball are for bulky Water types. Thunderbolt also hits Flying types whereas Energy Ball hits Ground and Rock types as well as Water types that are immune to Thunderbolt. Destiny Bond can be used to take down an opposing Pokemon on your way out.

Other options include Will-O-Wisp which is useful for burning the majority of physical attackers. Pain Split can be used for recovering health. Taunt is good for stopping stall and defensive Pokemon relying on status, hazards and set-up moves. Life Orb is for extra power, Spooky Plate is for buffing Shadow Ball's power while Colbur Berry allows her to survive Dark type moves.

The plan is straightforward, really. You send out Mismagius somewhere in the battle and Mean Look. After that, you Perish Song and boom! Them plot is set. You can further abuse the opponent by will-o-wisping and down their attack goes. Protect is to further stalling, Pain Split for healing, and Shadow Ball to not be taunt bait.